<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <header>网页的头部区域
        <nav>导航菜单</nav>
    </header>
    <main>页面主要内容</main>
    <footer>网页的脚部区域</footer>

</body>
</html>